Supporting information

Optimizing the Oxygen Reduction Reaction Activity of Pd Based

Nanocatalyst by Tuning Strain and Particle Size

Weiping Xiao,a Marco Aurelio Liutheviciene Cordeiro,b Mingxing Gong, a Lili Han, c

Jie Wang,a Ce Bian,a Jing Zhu,a Huolin Xin,b and Deli Wang a,*

Table S1 The ICP-AES results of Pd2FeCo@Pt/C catalyst.

Pd2FeCo@Pt/C Weight ratio Atom ratio

Pt:Pd:Fe:Co-initial 2.7:100:23.0:25.5 1.5:100: 43.7:46.0

Pt:Pd:Fe:Co-ADT 3.1:100:21.7:23.5 1.7:100: 41.2:42.3

Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A.This journal is © The Royal Society of Chemistry 2017

Table S2 Comparison of MA at 0.9 V for Pd(Au)M@Pt and Pt/C extracted from

literature.

CatalystsMA at

0.9 VRHE

MA (Pt/C) at

0.9 VRHE

Electrolyte Refs

Pd@Pt2-3L 0.49 A mgPt-1 0.1 A mgPt

-1 0.1 M HClO4 1

Pd(core)-Pt(shell) 0.2 A mgPt-1 0.12 A mgPt

-1 0.1 M HClO4 2

Pd@Pt1L 0.35 A mgPt-1 0.12 A mgPt

-1 0.1 M HClO4 3

Pd@Pt 1.6 A mgPt-1 0.32 A mgPt

-1 0.1 M HClO4 4

Pd@Pt1.8Ni 0.8 A mgPt-1 0.16 A mgPt

-1 0.1 M HClO4 5

PtML/Pd9Au1 0.31 A mgPt-1 0.1 A mgPt

-1 0.1 M HClO4 6

Pd@Pt 1.56 A mgPt-1 0.081 A mgPt

-1 0.1 M HClO4 7

Pd3Au@Pt 0.94 A mgPt-1 0.203 A mgPt

-1 0.1 M HClO4 8

AuCu@Pt 0.56 A mgPt-1 0.098 A mgPt

-1 0.5 M H2SO4 9

AuCu@Pt 0.57 A mgPt-1 0.11 A mgPt

-1 0.1 M HClO4 10

Pd@Pt-Ni 2.5 A mgPt-1 0.2 A mgPt

-1 0.1 M HClO4 11

Pd8CoZn@Pt 2.18A mgPt-1 0.07 A mgPt

-1 0.1 M HClO4 12

Pd@Pt 0.24 A mgPt-1 0.1 A mgPt

-1 0.1 M KOH 13

AuCu@Pt 0.86A mgPt-1 0.088 A mgPt

-1 0.1 M KOH 14

Pd2FeCo@Pt 2.5 A mgPt-1 0.066 A mgPt

-1 0.1 M HClO4 This work

Pd2FeCo@Pt 5.4 A mgPt-1 0.048 A mgPt

-1 0.1 M KOH This work

Table S3 Comparison of key performance parameters for Zn-air batteries extracted

from literature.

CatalystsLoading(mg cm-2)

Peak power density

Electrolyte Refs

CuPt-NC 2.0 250 mW cm-2 6 M KOH 15　

Pb2Ru2O6.5 — 195 mW cm-26 M KOH + 0.2 M

ZnO16　

P,S-CNS 0.5 198 mW cm-2 6 M KOH 17

S-DGF — 300 mW cm-26 M KOH + 0.2 M

ZnCl218　

C–CoPAN900 1.0 125 mW cm-26 M KOH +0.2 M

ZnCl219

CoO/N-CNT+NiFe LDH/CNT

1.0 265 mW cm-26 M KOH + 0.2 M

zinc acetate20　

Co@NG-acid 1.0 350 mW cm-2 6 M KOH 21

CuFe alloy　 　 212 mW cm-2　 6 M KOH　 22　

NiCo2S4/N-CNT 1.0 147 mW cm-26 M KOH + 0.2 M

ZnCl223

CoFe@NCNTs 1.0 150 mW cm-26 M KOH + 0.2 M

zinc acetate24 　

Pd2FeCo/C 1.0 256 mW cm-26 M KOH + 0.2 M

zinc acetateThiswork

Pd2FeCo@Pt/C 1.0 308 mW cm-26 M KOH + 0.2 M

zinc acetateThiswork

　

Fig. S1 XPS curves of Fe on Pd2FeCo/C nanoparticles.

Fig. S2 Overview STEM image of PdFe/C nanoparticles.

Fig. S3 Overview STEM image of PdCo/C nanoparticles.

Fig. S4 XPS curves of Pd2FeCo/C nanoparticles.

Fig. S5 (a) The rotation-rate-dependent current-potential curves of Pd2FeCo/C. (b)

The Koutecky-Levich plots on Pd2FeCo/C at different potentials.

Fig. S6 (a) Mass activities and (b) specific activities at 0.85 V and 0.9 V, respectively.

Fig. S7 CV curves of Pd/C, PdFe/C, PdCo/C and Pd2FeCo/C in N2-saturated 0.1 M

HClO4 solution, sweep rate, 50 mV s-1.

Fig. S8 ECSA of Pd/C, PdFe/C, PdCo/C and Pd2FeCo/C catalysts.

Fig. S9 The relationship between specific activity and lattice constant (a), binding

energy (b) of Pd.

Fig. S10 ORR polarization curves of Pd2FeCo/C-300 and Pd2FeCo/C-500.

Fig. S11 XRD patterns of Pd2FeCo/C-300 and Pd2FeCo/C-500.

Fig. S12 (a) The rotation-rate-dependent current-potential curves of Pd2FeCo@Pt/C.

(b) The Koutecky-Levich plots on Pd2FeCo@Pt/C at different potentials.

Fig. S13 CV curves of Pd2FeCo@Pt/C and Pt/C nanoparticles before and after 10,

000 cycles durability test in 0.1 M N2-saturated HClO4, sweep rate, 50 mV s-1.

Fig. S14 Specific capacities of the Zn-air batteries using Pd2FeCo@Pt/C and Pt/C as

ORR catalyst at current densities of 5 and 20 mA cm−2.

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